:root{
  --tm-bg:#f6f8fb; --tm-panel:#ffffff; --tm-text:#18212f; --tm-muted:#637083; --tm-border:#d9e0ea;
  --tm-primary:#2563eb; --tm-primary-hover:#1d4ed8; --tm-secondary:#eef2f7;
  --tm-shadow:0 10px 24px rgba(20,31,56,.08); --tm-radius:18px; --tm-radius-sm:12px; --tm-container:1120px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:linear-gradient(180deg,#f8fbff 0%, var(--tm-bg) 100%);color:var(--tm-text);line-height:1.6}
a{color:var(--tm-primary);text-decoration:none} a:hover{text-decoration:underline}
.tm-container{width:min(calc(100% - 32px), var(--tm-container));margin:0 auto}
.tm-header{position:sticky;top:0;z-index:20;backdrop-filter:blur(10px);background:rgba(255,255,255,.88);border-bottom:1px solid rgba(217,224,234,.8)}
.tm-header__inner{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.tm-logo{color:var(--tm-text);font-weight:800;font-size:20px;letter-spacing:.1px}.tm-logo:hover{text-decoration:none}
.tm-header__right{display:flex;align-items:center;gap:18px}
.tm-nav{display:flex;gap:18px;flex-wrap:wrap}.tm-nav a{color:var(--tm-muted);font-weight:600;font-size:14px}
.tm-nav-toggle{display:none;width:44px;height:44px;border:1px solid var(--tm-border);border-radius:12px;background:#fff;padding:10px;cursor:pointer}
.tm-nav-toggle span{display:block;height:2px;background:var(--tm-text);border-radius:999px}.tm-nav-toggle span + span{margin-top:6px}
.tm-lang-switch{display:flex;align-items:center;gap:8px;padding:6px;border:1px solid var(--tm-border);border-radius:999px;background:#fff}
.tm-lang-switch a{display:inline-flex;align-items:center;justify-content:center;padding:8px 12px;min-width:44px;border-radius:999px;color:var(--tm-muted);font-size:13px;font-weight:800}
.tm-lang-switch a:hover{text-decoration:none;background:#f8fafc}.tm-lang-switch a.is-active{background:var(--tm-primary);color:#fff}
.tm-page{padding:40px 0 42px}.tm-breadcrumbs{color:var(--tm-muted);font-size:14px;margin-bottom:12px}
.tm-hero,.tm-card,.tm-tool-panel{background:var(--tm-panel);border:1px solid var(--tm-border);border-radius:var(--tm-radius);box-shadow:var(--tm-shadow);padding:28px}
.tm-hero{margin-bottom:20px}
.tm-title{margin:0 0 10px;font-size:clamp(32px,4vw,48px);line-height:1.08;letter-spacing:-.02em}
.tm-lead{margin:0;max-width:760px;color:var(--tm-muted);font-size:17px}
.tm-hero__meta{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.tm-badge{display:inline-flex;padding:8px 12px;border-radius:999px;background:#f1f5f9;border:1px solid var(--tm-border);color:var(--tm-muted);font-size:12px;font-weight:700}
.tm-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
.tm-content-grid{display:grid;grid-template-columns:2fr 2fr;gap:20px;margin-top:20px}
.tm-card h2,.tm-tool-panel h2{margin:0 0 10px;font-size:22px}.tm-card h3{margin:22px 0 10px;font-size:18px}
.tm-card p,.tm-card li{color:#344054}.tm-card ul,.tm-card ol{padding-left:20px;margin:0}
.tm-tool-panel__text{margin:0 0 14px;color:var(--tm-muted);font-size:14px}
textarea{width:100%;min-height:300px;resize:vertical;border:1px solid var(--tm-border);border-radius:var(--tm-radius-sm);padding:15px 16px;font:inherit;color:var(--tm-text);background:#fff;outline:none}
textarea:focus{border-color:#9bbaf7;box-shadow:0 0 0 4px rgba(37,99,235,.12)}
.tm-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.tm-btn{appearance:none;border:none;border-radius:999px;padding:12px 18px;font:inherit;font-weight:700;cursor:pointer}
.tm-btn--primary{background:var(--tm-primary);color:#fff}.tm-btn--secondary{background:var(--tm-secondary);color:var(--tm-text)}
.tm-stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.tm-chip{padding:8px 12px;border-radius:999px;border:1px solid var(--tm-border);background:#f8fafc;font-size:13px;color:var(--tm-muted)}
.tm-ad{margin:24px 0;min-height:110px;display:grid;place-items:center;text-align:center;background:#f8fafc;border:1px dashed #c7d1df;border-radius:var(--tm-radius);color:var(--tm-muted);font-size:14px;padding:20px}
.tm-tool-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.tm-tool-list a{display:block;padding:12px 14px;border-radius:12px;border:1px solid var(--tm-border);background:#f8fafc;color:var(--tm-text);font-weight:600}
.tm-tool-list a:hover{background:#edf3ff;text-decoration:none}
details{border:1px solid var(--tm-border);border-radius:14px;padding:14px 16px;background:#fff} details + details{margin-top:10px}
summary{cursor:pointer;font-weight:700}
.tm-footer{padding:22px 0 42px;color:var(--tm-muted);font-size:14px}
.tm-footer__inner{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid var(--tm-border);padding-top:18px}
.tm-footer__brand{font-weight:800;color:var(--tm-text);margin-bottom:4px}.tm-footer__links{display:flex;gap:16px;flex-wrap:wrap}.tm-footer__links a{color:var(--tm-muted)}
@media (max-width:920px){.tm-grid,.tm-content-grid{grid-template-columns:1fr}textarea{min-height:240px}}
@media (max-width:760px){.tm-nav-toggle{display:block}.tm-header__right{width:100%;display:flex;flex-direction:column;align-items:stretch;gap:12px}.tm-nav{display:none;width:100%;flex-direction:column;gap:12px;padding:12px 0 6px}.tm-nav.is-open{display:flex}.tm-header__inner{min-height:auto;padding:14px 0;flex-wrap:wrap;align-items:center}}
@media (max-width:640px){.tm-page{padding-top:24px}.tm-hero,.tm-card,.tm-tool-panel{padding:18px}.tm-actions .tm-btn{width:100%}.tm-lead{font-size:16px}}
.logo {
  font-size: 26px;
  font-weight: 700;
  text-decoration: none;
  font-family: system-ui, -apple-system, sans-serif;
  letter-spacing: -0.5px;
}

.logo-tool {
  color: #374151; /* более приятный серый */
}

.logo-minto {
  color: #3b82f6; /* фирменный синий */
}
.logo:hover .logo-minto {
  opacity: 0.8;
}

.tm-logo{display:inline-flex;align-items:center;gap:12px}
.tm-logo__img{display:block;height:34px;width:auto}
.tm-logo__text{display:none}
@media (max-width:640px){
  .tm-logo__img{height:30px}
}

/* Math categories */

.tm-math-groups {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.tm-math-group {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.tm-math-group h2 {
  margin: 0;
  font-size: 32px;
  line-height: 1.2;
}

.tm-math-group h3 {
  margin: 12px 0 4px;
  font-size: 22px;
  color: var(--tm-text-secondary);
}

.tm-math-group .tm-tool-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tm-math-group .tm-tool-list li {
  margin: 0;
}

.tm-math-group .tm-tool-list a {
  display: block;
  padding: 10px 14px;
  border: 1px solid var(--tm-border);
  border-radius: 12px;
  background: #fff;
  transition: all .18s ease;
  text-decoration: none;
}

.tm-math-group .tm-tool-list a:hover {
  border-color: var(--tm-primary);
  background: #f8fbff;
  transform: translateY(-1px);
}

/* Mobile */

@media (max-width: 768px) {
  .tm-math-group .tm-tool-list {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .tm-math-group h2 {
    font-size: 26px;
  }

  .tm-math-group h3 {
    font-size: 20px;
  }
}
.tm-related-tools {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tm-related-tools h2 {
  margin: 0;
}

.tm-related-tools h3 {
  margin: 0;
  font-size: 18px;
  color: var(--tm-text-secondary);
}

.tm-related-more {
  margin-top: 4px;
}

.tm-related-more summary {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--tm-primary);
  list-style: none;
}

.tm-related-more summary::-webkit-details-marker {
  display: none;
}

.tm-related-more summary::after {
  content: "▾";
  transition: transform .18s ease;
}

.tm-related-more[open] summary::after {
  transform: rotate(180deg);
}

.tm-related-more .tm-tool-list {
  margin-top: 12px;
}